You can read more about the application here: Fill and Sign PDF Forms for Android. News in version 2.4 are:
- using new AAAU library
- using new About library
- using direct download link for Signature Capture library
- displaying proper error message in case form field names contain invalid characters
- adding VIEW action for PDF documents
- adding configurable parameters for Signature Capture (stroke width, signature area)
Application is still free, it can be downloaded from Android Market here:
Fill and Sign PDF Forms on Android Market.
It is also available on a bunch of other alternative Android App Stores.